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Name of following coordinatin entities a...

Name of following coordinatin entities and describe their structures :
(i) `[Fe(CN)_(6)]^(4-)`
(ii) `[Cr(NH_(3))_(4)Cl_(2)]^(+)`
(iii) `[Ni(CN)_(4)]^(2-)`
[Atomic number Fe = 26 , Cr = 24 , Ni = 28]

Text Solution

Verified by Experts

(i) `[Fe(CN)_(6)]^(4-) , d^(2)Sp^(3)` , Octahedral diamagnetic Electronic configuration of Fe = `[Ar] 3d^(6) 4s^(2)` Electronic configuration of `Fe^(2+) = [Ar] 3d^(6)` . To accommodate six pairs of electrons from six cyanide ions , the iron (II) ion must make available six empty orbitals .
Name : Hexacynoferrate (II) ion , Structure -Octahedral .
(ii) `[Cr(NH_(3))_(4)Cl_(2)]^(+)`
Structure : Octahedral `(d^(2)SP^(3))`
Name : Tetraammine dichloridochromium (iii) ion

(iii) `[Ni(CN)_(4)]^(2-)`
In the square planar complexes , the hybridisation involved is `dsp^(2)` . In `[Ni(CN)_(4)]^(2-)` nickel is in `+2` oxidation state and has the electronic configuration `3d^(8)` .
Structure : Square Plane
Name : Tetracyanoniclate (ii) ion
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